
package keul.planner.servlets;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Auf dieses Servlet werden alle Anfragen gemappt, die
 * auf /maps/* fallen. Es wird dann
 * versucht, ein Bild mit entsprechenden Namen zu finden.
 * @author kev
 */
@WebServlet(name = "MapDrawerServlet", urlPatterns = {"/maps/*"})
public class ImageMapperServlet extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("image/jpg");
        PrintWriter out = response.getWriter();
        try {
            FileInputStream in = null; 	   
            int c;
            int cutLength = request.getContextPath().length() + 1 + 4 + 1;
            in = new FileInputStream( "c:\\maps\\" + request.getRequestURI().substring(cutLength) );
            
            try { // Datei auf dem Server lokalisieren und byte-weise zurückgeben
                while ((c = in.read()) != -1)
                    out.write(c);
            } finally {
                if (in != null)
                    in.close();
            }
        } finally {            
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
